The phrase "rather than" in line 21 is closest in meaning to（）
A. in addition to
B. instead of
C. as a replacement
D. such as
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what does the author mean by stating in line 7 that "this analogy is not far off the mark"（）
A. The definition is not precise
B. The discussion lacks necessary information
C. The differences are probably significant
D. The comparison is quite appropriate
The word "revitalize" in line 22 is closest in meaning to（）
A. show the importance of
B. promise to enlarge
C. bring new life to
D. provide artworks for
According to the passage, when did the domestication of plants begin in North America（）
A. 7,000 years ago
B. 4,000 to 2,000 years ago
C. Long after the Neolithic period
D. Before the Archaic period
According to the passage, how are ants guided by trail pheromones（）
A. They concentrate on the smell of foo
B. They follow an ant who is familiar with the trail
C. They avoid the vapor spaces by moving in a straight lin
D. They sense the vapor through their antenna
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